CVE-2026-71973: medium-severity vulnerability in u-boot
U-Boot before 2026.10-rc4 Integer Overflow in SquashFS Directory Table Allocation
Published · Updated
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.2epss 0.2%
exploitation probability
0.2%top 93% of all CVEs
observed exploitation
nono source reports it
U-Boot before 2026.10-rc4 contains an integer overflow vulnerability in sqfs_read_directory_table() function when allocating the directory table buffer. Attackers can supply a crafted SquashFS image with an attacker-controlled superblock metablks_count value that causes heap buffer under-allocation and out-of-bounds writes, corrupting heap memory and crashing the bootloader.
CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
Affected products
u-boot · u-bootRelated CVEs — u-boot
In the same product, most dangerous first.
CVE-2026-29009HIGHU-Boot < 2026.07-rc2 Buffer Overflow in nfs_readlink_reply() via NFS READLINKEPSS 0.7%CVE-2026-29008HIGHU-Boot 2026.04-rc3 Integer Underflow DoS via tcp_rx_state_machine()EPSS 0.7%CVE-2026-29007MEDIUMU-Boot 2026.04-rc3 Out-of-Bounds Read in tcp_rx_state_machine via tcp.cEPSS 0.7%CVE-2026-71971HIGHU-Boot before 2026.10-rc3 Out-of-Bounds Write in IP Fragment ReassemblyEPSS 0.4%CVE-2026-74221HIGHU-Boot before 2026.10-rc5 Buffer Overflow via NFS READLINKEPSS 0.3%CVE-2026-74220HIGHU-Boot before 2026.10-rc5 Buffer Overflow via NFS READ ReplyEPSS 0.3%
References
https://github.com/u-boot/u-boothttps://github.com/u-boot/u-boot/blob/v2026.07/fs/squashfs/sqfs.c#L814https://github.com/u-boot/u-boot/commit/561ae28cb56a082cfa90c1c421c4955bc215470bhttps://www.vulncheck.com/advisories/u-boot-before-2026.10-rc4-integer-overflow-in-squashfs-directory-table-allocation